f(x)'s Krystal Flexing Acting Muscles in MBC Sitcom

Life is sweet for K-pop star and TV celebrity Krystal, who at 17 is already more famous than most teenagers in the country and has designs to one day feature in action movies.

The member of girl group f(x), and sister of 22-year-old Jessica of Girls' Generation, is already flexing her acting muscles in MBC's daily sitcom, "High Kick 3: The Revenge of the Short Legged." But she said later she hopes to move on to more ambitious roles.

"I'm afraid of acting in movies or serious dramas now, but I'll definitely try it someday," she said. "I especially want to do action scenes, like flying in the air on wires."

In the sitcom, Krystal's second since she debuted last year, she portrays an adolescent girl and gets to show off her English-speaking prowess. The actress was born in the U.S. and attended international schools when she returned to Korea, giving her an advantage in terms of English fluency.

Krystal was picked up by an entertainment agency at the age of seven, began her training when she was 13 and debuted as a singer in 2009. She said is was tough to juggle the demands of being both a singer and actress at such an early age, but also rewarding.

"I started doing this because it was fun and exciting, and now I can't give up either acting or singing," she said. "As I'm only human, there are times when I struggle. But whenever I think about quitting, it makes me nervous. This is what I was born to do."